From e586dc19df2ad0e87952c158dc00be3b799e0480 Mon Sep 17 00:00:00 2001
From: SimFG <1142838399@qq.com>
Date: Thu, 7 Jul 2022 11:43:54 +0800
Subject: [PATCH] lease: Rename `Poll` to `Peek` in the `LeaseExpiredNotifier`

`Poll` means that the elements in the heap will be removed.
And it is more appropriate to use `Peek` to get the top of the heap.

Signed-off-by: SimFG <1142838399@qq.com>
---
 server/lease/lease_queue.go      | 2 +-
 server/lease/lease_queue_test.go | 8 ++++----
 server/lease/lessor.go           | 2 +-
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/server/lease/lease_queue.go b/server/lease/lease_queue.go
index ffb7285ec..b5890ecbd 100644
--- a/server/lease/lease_queue.go
+++ b/server/lease/lease_queue.go
@@ -96,7 +96,7 @@ func (mq *LeaseExpiredNotifier) Unregister() *LeaseWithTime {
 	return item
 }
 
-func (mq *LeaseExpiredNotifier) Poll() *LeaseWithTime {
+func (mq *LeaseExpiredNotifier) Peek() *LeaseWithTime {
 	if mq.Len() == 0 {
 		return nil
 	}
diff --git a/server/lease/lease_queue_test.go b/server/lease/lease_queue_test.go
index c12003561..9b9bb772f 100644
--- a/server/lease/lease_queue_test.go
+++ b/server/lease/lease_queue_test.go
@@ -40,8 +40,8 @@ func TestLeaseQueue(t *testing.T) {
 	}
 
 	// first element is expired.
-	if le.leaseExpiredNotifier.Poll().id != LeaseID(1) {
-		t.Fatalf("first item expected lease ID %d, got %d", LeaseID(1), le.leaseExpiredNotifier.Poll().id)
+	if le.leaseExpiredNotifier.Peek().id != LeaseID(1) {
+		t.Fatalf("first item expected lease ID %d, got %d", LeaseID(1), le.leaseExpiredNotifier.Peek().id)
 	}
 
 	existExpiredEvent := func() {
@@ -60,8 +60,8 @@ func TestLeaseQueue(t *testing.T) {
 			t.Fatalf("expected the expired lease to be pushed back to the heap, heap size got %d", le.leaseExpiredNotifier.Len())
 		}
 
-		if le.leaseExpiredNotifier.Poll().id != LeaseID(1) {
-			t.Fatalf("first item expected lease ID %d, got %d", LeaseID(1), le.leaseExpiredNotifier.Poll().id)
+		if le.leaseExpiredNotifier.Peek().id != LeaseID(1) {
+			t.Fatalf("first item expected lease ID %d, got %d", LeaseID(1), le.leaseExpiredNotifier.Peek().id)
 		}
 	}
 
diff --git a/server/lease/lessor.go b/server/lease/lessor.go
index 1318552dd..b369bd546 100644
--- a/server/lease/lessor.go
+++ b/server/lease/lessor.go
@@ -683,7 +683,7 @@ func (le *lessor) expireExists() (l *Lease, ok bool, next bool) {
 		return nil, false, false
 	}
 
-	item := le.leaseExpiredNotifier.Poll()
+	item := le.leaseExpiredNotifier.Peek()
 	l = le.leaseMap[item.id]
 	if l == nil {
 		// lease has expired or been revoked